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Expert System for Natural Gas Transportation Network

Partners. TBG. SCGÁS. Rio Pipeline Conference and Exposition 2003. Expert System for Natural Gas Transportation Network. Jonny Carlos da Silva, D. Eng. Gilson Simões Porciúncula, M. Eng. . Overview :. Context Objectives and contributions SEGRED Functions Project development

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Expert System for Natural Gas Transportation Network

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  1. Partners TBG SCGÁS Rio Pipeline Conference and Exposition 2003 Expert System for Natural Gas Transportation Network Jonny Carlos da Silva, D. Eng. Gilson Simões Porciúncula, M. Eng.

  2. Overview: Context Objectives and contributions SEGRED Functions Project development System Description System Expansion Conclusion

  3. Context : Remote Monitoring of process variables according to contract rules Hundreds of continuous variables (such as pressure, flow, temperature, and discrete variables) are monitored in some points of the pipeline

  4. SEGRED General Information • Period: 2 years (Jan. 2001 to Dec. 2002) • Project Team • LASHIP Knowledge Engineering Team - 12 members • including 2 professors, 6 engineers (4 MSc), 4 undergraduate students • Plus Domain Experts from the Partnering Companies • Investment: US$ 220,000

  5. TBG Networks in Brazil TBG - responsible for operating the largest gas pipeline in Latin America on Brazilian soil. Its pipeline covers more than 3,000 km, it runs from Santa Cruz, in Bolivia, up to Rio Grande do Sul, in Brazil.

  6. Objectives • Development of software to support operation and maintenance management of natural gas transportation networks, integrating experts systems and dynamic simulation. • Contributions • reduction of operational costs • increase reliability • improve maintenance and operation • organize part of the corporative memory

  7. First mapped sector TBG/DVS Araucária Joinville Guaramirim Gaspar Brusque Tijucas Biguaçu Context Pipeline TBG/DVS South Division- Santa Catarina State Focus on CITY GATE

  8. SEGRED Functions: • Analysis of current operational state • Diagnosis – failures detection and maintenance recommendations. • Prognosis – Capacity to predict the network behavior based on dynamic simulation. • Generation of reports for maintenance • Acquisition of process variables

  9. Graphical Interface Expert System Environment SEGRED Structure USER Agent Module Diagnosis Module Application Domain AMESimSimulation System

  10. Maintenance Module System development : Integration between Expert System and Simulator Configuration scenarios Validation process variables Analysis and prognosis of failures with generation of suggestions operational failures diagnosis and generation of procedures for maintenance Agent

  11. Agent Concept- Expert System and Simulation Software • Two Phase process: • SEGRED system defines parameter for simulation, i.e. different scenarios configurations • it analyzes the simulation data and infers problems that may occur in the networks.

  12. Consumer affected Closing Valve Prognosis REPORT for different Consumers SEGRED- Prognosis based on Dynamic Simulation Distribution Network Model CITY GATE Consumer

  13. Failure of station global function Station delivers gas under unregulated pressure, and temperature below limit Failure of partial (subsystems) functions Heating System water temp below 80°C Reducing Pressure System Valve lost action of control Absence of gas of utility or inferior the 35,5 psig . PCV1A Unregulated above of set of the PCV1Á Failure of Component Function TC51 unregulated for temperature low PCV1A with the valve of relief of camera opened TC51 damaged due to low temperature PCV1A Valve with diaphragm of the pilots breached Example of Knowledge ModelingDiagnostic Function- FTA

  14. Prototype Description Configuration and Evaluation of the operational scenario

  15. Prototype Description Analysis Evaluation of current network state. Prognosis Based on DYNAMIC SIMULATION

  16. Prototype Description Some rules implemented • If upstream pressure in some City Gate (Delivery Station) is lower than a minimum defined by design, that station will not properly deliver gas. • If upstream pressure in some ECOMP (Compressing Station) is below its limit a decrease in the station efficiency will occur. • If gas demand in some City Gate is lower than the specified value a malfunction can take place. Usually, pressure control valves decrease their accuracy.

  17. Subsystems Failure CityGate Diagnosis

  18. Subsystems Diagnosis Diagnosis Report Pressure Control System Possible Failures FailureModes

  19. SEGRED II Phase Based on its successful outcome, the SEGRED Project will be expanded. In this second phase, TBG and Petrobras defined a new scope, including new functions to be added, such as: • Linebreak Detection • Bottleneck Detection • Composition Module Tracking • Increase of system topology- REPLAN-GUARAREMA stretch

  20. NEWSector REPLAN Guararema Conclusion The integration between expert systems and dynamic simulation is a synergic solution for operation of gas networks. The SEGRED-TBG system will become an innovative tool in the area of management of natural gas transportation, able to be expanded for all network.

  21. More Information SEGRED project Website www.laship.ufsc.br/segred

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